source: mainline/uspace/drv/bus/usb/vhc/transfer.c@ a06fd64

/*
 * Copyright (c) 2011 Vojtech Horky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <errno.h>
#include <str_error.h>
#include <usb/debug.h>
#include <usbvirt/device.h>
#include <usbvirt/ipc.h>
#include "vhcd.h"
#include "hub/virthub.h"

static bool is_set_address_transfer(vhc_transfer_t *transfer)
{
        if (transfer->batch->ep->endpoint != 0) {
                return false;
        }
        if (transfer->batch->ep->transfer_type != USB_TRANSFER_CONTROL) {
                return false;
        }
        if (usb_transfer_batch_direction(transfer->batch) != USB_DIRECTION_OUT) {
                return false;
        }
        const usb_device_request_setup_packet_t *setup =
            (void*)transfer->batch->setup_buffer;
        if (setup->request_type != 0) {
                return false;
        }
        if (setup->request != USB_DEVREQ_SET_ADDRESS) {
                return false;
        }

        return true;
}

static int process_transfer_local(usb_transfer_batch_t *batch,
    usbvirt_device_t *dev, size_t *actual_data_size)
{
        int rc;
        
        const usb_direction_t dir = usb_transfer_batch_direction(batch);

        if (batch->ep->transfer_type == USB_TRANSFER_CONTROL) {
                if (dir == USB_DIRECTION_IN) {
                        rc = usbvirt_control_read(dev,
                            batch->setup_buffer, batch->setup_size,
                            batch->buffer, batch->buffer_size,
                            actual_data_size);
                } else {
                        assert(dir == USB_DIRECTION_OUT);
                        rc = usbvirt_control_write(dev,
                            batch->setup_buffer, batch->setup_size,
                            batch->buffer, batch->buffer_size);
                }
        } else {
                if (dir == USB_DIRECTION_IN) {
                        rc = usbvirt_data_in(dev, batch->ep->transfer_type,
                            batch->ep->endpoint,
                            batch->buffer, batch->buffer_size,
                            actual_data_size);
                } else {
                        assert(dir == USB_DIRECTION_OUT);
                        rc = usbvirt_data_out(dev, batch->ep->transfer_type,
                            batch->ep->endpoint,
                            batch->buffer, batch->buffer_size);
                }
        }

        return rc;
}

static int process_transfer_remote(usb_transfer_batch_t *batch,
    async_sess_t *sess, size_t *actual_data_size)
{
        int rc;

        const usb_direction_t dir = usb_transfer_batch_direction(batch);

        if (batch->ep->transfer_type == USB_TRANSFER_CONTROL) {
                if (dir == USB_DIRECTION_IN) {
                        rc = usbvirt_ipc_send_control_read(sess,
                            batch->setup_buffer, batch->setup_size,
                            batch->buffer, batch->buffer_size,
                            actual_data_size);
                } else {
                        assert(dir == USB_DIRECTION_OUT);
                        rc = usbvirt_ipc_send_control_write(sess,
                            batch->setup_buffer, batch->setup_size,
                            batch->buffer, batch->buffer_size);
                }
        } else {
                if (dir == USB_DIRECTION_IN) {
                        rc = usbvirt_ipc_send_data_in(sess, batch->ep->endpoint,
                            batch->ep->transfer_type,
                            batch->buffer, batch->buffer_size,
                            actual_data_size);
                } else {
                        assert(dir == USB_DIRECTION_OUT);
                        rc = usbvirt_ipc_send_data_out(sess, batch->ep->endpoint,
                            batch->ep->transfer_type,
                            batch->buffer, batch->buffer_size);
                }
        }

        return rc;
}

static vhc_transfer_t *dequeue_first_transfer(vhc_virtdev_t *dev)
{
        assert(fibril_mutex_is_locked(&dev->guard));
        assert(!list_empty(&dev->transfer_queue));

        vhc_transfer_t *transfer = list_get_instance(
            list_first(&dev->transfer_queue), vhc_transfer_t, link);
        list_remove(&transfer->link);

        return transfer;
}

static void execute_transfer_callback_and_free(vhc_transfer_t *transfer,
    size_t data_transfer_size, int outcome)
{
        assert(outcome != ENAK);
        assert(transfer);
        assert(transfer->batch);
        usb_transfer_batch_finish_error(transfer->batch, NULL,
            data_transfer_size, outcome);
        usb_transfer_batch_destroy(transfer->batch);
        free(transfer);
}

int vhc_init(vhc_data_t *instance)
{
        assert(instance);
        list_initialize(&instance->devices);
        fibril_mutex_initialize(&instance->guard);
        instance->magic = 0xDEADBEEF;
        return virthub_init(&instance->hub, "root hub");
}

int vhc_schedule(hcd_t *hcd, usb_transfer_batch_t *batch)
{
        assert(hcd);
        assert(batch);
        vhc_data_t *vhc = hcd_get_driver_data(hcd);
        assert(vhc);

        vhc_transfer_t *transfer = malloc(sizeof(vhc_transfer_t));
        if (!transfer)
                return ENOMEM;
        link_initialize(&transfer->link);
        transfer->batch = batch;

        fibril_mutex_lock(&vhc->guard);

        int targets = 0;

        list_foreach(vhc->devices, link, vhc_virtdev_t, dev) {
                fibril_mutex_lock(&dev->guard);
                if (dev->address == transfer->batch->ep->address) {
                        if (!targets) {
                                list_append(&transfer->link, &dev->transfer_queue);
                        }
                        ++targets;
                }
                fibril_mutex_unlock(&dev->guard);
        }

        fibril_mutex_unlock(&vhc->guard);
        
        if (targets > 1)
                usb_log_warning("Transfer would be accepted by more devices!\n");

        return targets ? EOK : ENOENT;
}

int vhc_transfer_queue_processor(void *arg)
{
        vhc_virtdev_t *dev = arg;
        fibril_mutex_lock(&dev->guard);
        while (dev->plugged) {
                if (list_empty(&dev->transfer_queue)) {
                        fibril_mutex_unlock(&dev->guard);
                        async_usleep(10 * 1000);
                        fibril_mutex_lock(&dev->guard);
                        continue;
                }

                vhc_transfer_t *transfer = dequeue_first_transfer(dev);
                fibril_mutex_unlock(&dev->guard);

                int rc = EOK;
                size_t data_transfer_size = 0;
                if (dev->dev_sess) {
                        rc = process_transfer_remote(transfer->batch,
                            dev->dev_sess, &data_transfer_size);
                } else if (dev->dev_local != NULL) {
                        rc = process_transfer_local(transfer->batch,
                            dev->dev_local, &data_transfer_size);
                } else {
                        usb_log_warning("Device has no remote phone nor local node.\n");
                        rc = ESTALL;
                }

                usb_log_debug2("Transfer %p processed: %s.\n",
                    transfer, str_error(rc));

                fibril_mutex_lock(&dev->guard);
                if (rc == EOK) {
                        if (is_set_address_transfer(transfer)) {
                                usb_device_request_setup_packet_t *setup =
                                    (void*) transfer->batch->setup_buffer;
                                dev->address = setup->value;
                                usb_log_debug2("Address changed to %d\n",
                                    dev->address);
                        }
                }
                if (rc == ENAK) {
                        // FIXME: this will work only because we do
                        // not NAK control transfers but this is generally
                        // a VERY bad idea indeed
                        list_append(&transfer->link, &dev->transfer_queue);
                }
                fibril_mutex_unlock(&dev->guard);

                if (rc != ENAK) {
                        execute_transfer_callback_and_free(transfer,
                            data_transfer_size, rc);
                }

                async_usleep(1000 * 100);
                fibril_mutex_lock(&dev->guard);
        }

        /* Immediately fail all remaining transfers. */
        while (!list_empty(&dev->transfer_queue)) {
                vhc_transfer_t *transfer = dequeue_first_transfer(dev);
                execute_transfer_callback_and_free(transfer, 0, EBADCHECKSUM);
        }

        fibril_mutex_unlock(&dev->guard);

        return EOK;
}